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As for the lower rad hose sensor, the DME is not seeing the disconnected sensor as reading a "low temp" but as "disconnected" and would then likely run the fan as a failsafe. I didn't spend a lot of time checking, but with the coolant sensor disconnected the fan ramped up to about 1/2 speed (DME still knows engine temp) and with the A/C sensor disconnected ramped up to high. Both ramped back down when re-connected. What is the reason for wanting adjustable active fan control ??
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
Last edited by 80stech; 05-29-2025 at 10:16 AM.
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05-29-2025, 10:06 AM
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